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Restricted Net Assets - Additional Information (Details) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2019 CNY (¥)
Restricted Net Assets [Abstract] |
Required minimum percentage of after-tax-profit allocated to general reserve | 10.00%
Threshold percentage of general reserve of the registered capital | 50.00%
Required minimum percentage of after-tax-profit allocated to statutory common reserve | 10.00%
Threshold percentage of statutory common reserve of the registered capital, used as criteria of allocation requirement | 50.00%
Amount of restricted paid-in-capital and statutory reserves | ¥ 1,189,308

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- Definition The maximum percentage of the appropriation to the statutory surplus fund over the after-tax profits calculated in accordance with PRC GAAP. + References No definition available. + Details
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- Definition The percentage of paid in capital that the general reserve would not surpass. + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Required percentage of after tax profit allocated to statutory common reserve. + References No definition available. + Details
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Period Type: | duration

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- Definition Restricted net assets. + References No definition available. + Details
Name: | stg_RestrictedNetAssetsAbstract
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- Definition Threshold percentage of statutory common reserve need to be made over entities registered capital. + References No definition available. + Details
Name: | stg_ThresholdPercentageOfStatutoryCommonReserveNeedToBeMadeOverEntitiesRegisteredCapital
Namespace Prefix: | stg_
Data Type: | num:percentItemType
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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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Balance Type: | debit
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